A model for the electron temperature variation along geomagnetic field lines and its effect on electron density profiles and VLF paths
Abstract
A model for the temperature variation along geomagnetic field lines is described. The temperature gradient along the field line is 0.91.6 deg/km during the day and 0.50.7 deg/km during the night at 1000 km, and it reduces to about half of these values at 2000 km, for the altitude range 3550 deg. A raytracing model is developed, and the effects of changes in temperature on electron density distribution and VLF paths are analyzed. It is shown that unducted ray paths are altered from their corresponding paths in an equivalent isothermal model, there is greater refraction, and magnetospheric reflection occurs at lower altitudes.
 Publication:

Journal of Atmospheric and Terrestrial Physics
 Pub Date:
 July 1986
 DOI:
 10.1016/00219169(86)900164
 Bibcode:
 1986JATP...48..671S
 Keywords:

 Atmospheric Models;
 Electron Energy;
 Geomagnetism;
 Ionospheric Electron Density;
 Magnetic Field Configurations;
 Vlf Emission Recorders;
 Periodic Variations;
 PlasmaElectromagnetic Interaction;
 Ray Tracing;
 Very Low Frequencies